01 Solution Summary
Workplace VOCs determination requires first determining the current method according to the target compounds and the purpose of occupational exposure assessment, then matching personal or fixed-point sampling, adsorption and desorption, GC separation, and detection channels. Quantification and quality control use the following arrangement: first determine the sample preparation, injection, and detection route according to the target compounds, sampling media, and current formal methods, then calibrate using corresponding reference materials and perform batch quality control. In the analytical batch, blanks, calibration checks, and applicable quality control samples are also set up.
02 Standards and Method Basis
Method basis: application method. The laboratory may enter the name and version of the adopted formal method into the project file.
03 Samples and Analytes
The specific samples areWorkplace personal or fixed-point air samples, and the analytes areAromatic Hydrocarbons, Halogenated Hydrocarbons, Oxygenated Volatile Organic Compounds, and Other VOCs Relevant to Occupational Exposure. Pretreatment, injection, and detection configurations are determined according to the sample state, target concentration, and the formal method adopted.
04 Method Principle
The VOCs in air are collected by sampling media matched to the target compounds and, after solvent desorption or thermal desorption, enter the GC system.
The chromatographic column completes the separation of target VOCs from coexisting components, and the detector is determined according to the compound response characteristics and the formal method used.
05 Sample Collection and Pretreatment
Sampling points, sampling periods, flow rates, and total volume should match the exposure assessment task; sampling media, sealed transport, storage time, and desorption steps should be performed according to the selected method.
06 Separation and Detection
The solvent desorption route uses liquid injection; the thermal desorption route uses sorbent tube heating, focusing, and inert transfer. FID, ECD, or MS is selected according to target compound response and method requirements.
07 Instrument System Configuration
| Module | Configuration | Role in This Solution |
|---|---|---|
| Sampling module | Personal/area samplers and matched sampling media | Obtain air samples matched to the exposure assessment task |
| Sample introduction | Solvent desorption liquid injection, or thermal desorption transfer | Introduce target VOCs into the GC |
| GC separation | Inlet and column matched to the target compounds | Separate target VOCs from coexisting components |
| Detection Unit | FID, ECD, or MS, selected according to the formal method | Acquire target compound response |
08 Huishi Instruments system configuration
This application requiresGas chromatography (GC) analysis systemComplete the analysis of benzene series compounds, halogenated hydrocarbons, oxygenated volatile organic compounds, and other VOCs related to occupational exposure. During selection, the sample introduction interface, detector, and data system should be determined based on the sample condition of workplace personal or area air samples, introduction into the measurement system as specified by current methods, and detection requirements.
09 Analysis workflow
10 Qualitative, Quantitative, and Quality Control
Field blanks, media blanks, pre- and post-sampling flow checks, calibration checks, and applicable spiked samples collectively cover the sampling, transport, desorption, and instrumental analysis processes.
11 Method and Configuration Selection
- Personal sampling is used to characterize worker exposure, and area sampling is used to characterize the workplace or process locations.
- The sampling media and desorption route must cover the volatility and polarity range of the target compounds.
- The detector and calibration range are determined jointly by the target compounds, limits, and the formal method.
12 Frequently Asked Questions
Why can't a single sorbent tube cover all VOCs?
Different VOCs differ in volatility, polarity, and adsorption/desorption characteristics; the sampling medium must match the target compounds and the formal method.
How should personal sampling and area sampling be selected?
When assessing personal workday exposure, personal sampling is preferred; when assessing contamination distribution at process points or locations, fixed-point sampling is used.
What information is needed before configuration?
Provide the list of target compounds, job positions and sampling purpose, expected concentrations, intended method, sample batch size, and existing laboratory configuration.
13 Related Solutions and Knowledge
Get Configuration and Technical Consultation
Please provide sample information for workplace personal or fixed-point air samples, the concentration ranges of benzene series, halogenated hydrocarbons, oxygenated volatile organic compounds, and other VOCs related to occupational exposure, testing batch size, method basis, and existing equipment. Huishi Instruments will use this to prepare a configuration list.
Information submitted.